Simply stir together flour, milk, granulated sugar, baking powder, vanilla sugar, oil, salt and eggs in a bowl, grease the Gugelhupf form (oil, lard), sprinkle with breadcrumbs.
Pour half of the liquid batter into the scattered mold. Mix the cocoa into the second half, add the raisins, pour into the mold.
Bake in the oven at 180 degrees until golden brown. To check if it`s baked enough, prick it with a toothpick, if it stays dry, remove it. Let cool down a bit - about 5 minutes - then turn it over on a flat plate, place a cold, damp cloth on the mold (chill it) and carefully remove the mold. Sprinkle with powdered sugar.